Revert https related changes to webpack config

What does this MR do and why?

This removes the ability to start webpack dev server with https configured. If we want https and webpack to work together in the GDK, we can simply proxy it through NGINX, which is how we currently do https in the GDK: gitlab-development-kit!2437 (merged)

Screenshots or screen recordings

N/A

How to set up and validate locally

This change is independent from: gitlab-development-kit!2437 (merged). So I guess, just checking out this branch and seeing that the dev server would start without https.

MR acceptance checklist

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